JP2000226802A - Fishplate for rail - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate generation of a big crack in a core part of a longitudinal direction at the time of pultrusion molding, and improve strength in a longitudinal direction and in a direction perpendicular to the longitudinal direction. SOLUTION: A joint plate for rails 1 connects between end parts of rails opposed to each other at a distance so as to overstride both side surface parts thereof. In that case, the joint plate is formed of a thermosetting resin reinforced along its longitudinal direction by roving 1A including bulky roving 1a1. Percentage content of the bulky roving in the total roving 1A is 10 to 25 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for connection between adjacent rails in the field of railways and the like.
The present invention relates to a rail joint plate.

[0002]

2. Description of the Related Art In general, at a connection point between rails for railroad, side members at ends of both rails and a member called a seam plate provided across the side surfaces are fastened by bolts. At the same time, both rails were fixed and connected via bolts. Such a rail connection point is the weakest part of the rail, and mechanical stresses such as repeated impacts and vibrations are applied by the passage of trains, etc. More steel ones were commonly used.

On the other hand, rails used for installation locations for traffic signals and level crossing alarms need to be divided into certain sections to form electric circuits, and insulating materials are partially used for insulation between circuits. Insulated seam plates are used. As the insulated seam plate, a steel seam and an insulated member such as an insulating plate and an insulating tube are most often used.

[0004] However, steel seam plates are heavy and workability at the time of mounting on rails is poor, and when used as insulating seam plates, it is necessary to use an insulating member together, so that the work is carried out on site. It takes a lot of man-hours in
Workability further worsens.

In view of the above, there has been proposed a seam plate in which the entire seam plate is formed of a fiber reinforced thermosetting resin (FRP), which is lightweight, has good workability, and can secure insulation without using an insulating member (see, for example, Japanese Patent Application Laid-Open No. H11-157556). JP-A-50-47302, etc.).

[0006] Such an FRP seam plate is formed of, for example, a thermosetting resin reinforced by glass roving, glass cloth and glass mat, and a core portion along its longitudinal direction is reinforced by glass roving. It is just being done. Therefore, when such a FRP seam plate is manufactured by a pultrusion molding method, its large thickness and large cracks caused by curing shrinkage of the thermosetting resin are reinforced only by glass roving in the longitudinal direction. There is a problem that it easily occurs in the core portion.

[0007]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems in the prior art, and does not generate a large crack in the core portion in the longitudinal direction at the time of pultrusion molding, so that the longitudinal direction and the direction perpendicular to the longitudinal direction are eliminated. The purpose of the present invention is to provide a rail joint plate made of FRP having excellent strength.

[0008]

SUMMARY OF THE INVENTION The present invention is a rail joint plate for connecting between ends of rails facing each other with a gap so as to straddle both side surfaces thereof, including a bulky roving. A rail joint plate formed of a thermosetting resin reinforced along the longitudinal direction by roving and having a bulky roving content of 10 to 25% by weight in all the rovings.

In the present invention, roving refers to a collection of many strands formed by bundling several hundred filaments. The fibers constituting the roving include, for example, glass fibers, aramid fibers, vinylon fibers, and the like. Glass fibers or glass fibers mixed with other fibers are particularly preferable in terms of low cost and strength.

[0010] In the present invention, as shown in FIG. 5, the bulky roving 1a _1, only bundled in a state in which fibers were aligned in a straight line in the longitudinal direction, the linear orientation as shown in FIG. 4 Jo of roving 1a _2, such as by loading the air pressure is obtained by machining a part of the fibers bulky to randomly oriented.

Bulk roving 1 in roving 1A
content of a ₁ is required to be 10 to 25 wt%. When the content in the entire roving 1A is less than 10% by weight,
Since the intersection with the linearly oriented rovings is reduced, large cracks are generated along the linearly oriented rovings in the core portion in the longitudinal direction at the time of pultrusion molding. , The strength in the longitudinal direction becomes insufficient, and the strength as a rail joint plate becomes insufficient.

In the present invention, the thermosetting resin includes
For example, unsaturated polyester resin, vinyl ester resin, epoxy resin, phenol resin, urethane resin, urethane-phenol resin and the like can be mentioned.

The contents of the roving and the thermosetting resin forming the rail joint plate of the present invention are from 72 to 7 rovings.
5% by weight and 25 to 28% by weight of a thermosetting resin are preferred.
When the content of the roving is less than 72% by weight and the content of the thermosetting resin exceeds 28% by weight, the reinforcement hardening by the roving tends to be small, and the content of the roving exceeds 75% by weight, If the content is less than 25% by weight, the number of banders where the thermosetting resin adheres between the rovings is reduced, and the strength of the product is likely to be reduced.

[0014] The rovings preferably comprise 60 to 70% by weight arranged along the longitudinal direction. If the orientation in the longitudinal direction exceeds 70% by weight, the intersection with the roving in the linear orientation is reduced, so that large cracks are likely to be generated in the core portion in the longitudinal direction along the roving in the linear orientation at the time of pultrusion molding, When the amount is less than the percentage by weight, the roving in the linear orientation decreases, and the strength in the longitudinal direction tends to be insufficient.

[0015]

The rail joint plate of the present invention is formed of a thermosetting resin reinforced along the longitudinal direction with rovings including bulky rovings, and the content of the bulky rovings in all the rovings is 10 to 25. By being the weight%, the fibers oriented in the random direction of the bulky roving enter between the linearly oriented rovings, and the intersections of the rovings occur, and are fixed in the thermosetting resin in that state. Even if the wall thickness is large, large cracks due to curing shrinkage of the thermosetting resin do not occur in the longitudinal core portion, and the longitudinal compressive strength, shear strength, bending strength, and longitudinal Excellent strength such as compressive strength and shear strength in the orthogonal direction.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view illustrating an example of the rail joint plate of the present invention. As shown in FIG.
The rail joint plate 1 is formed of a pair of rails which are connected to each other so as to straddle both ends of rails facing each other with a gap therebetween. The rail joint plate 1 is formed such that the upper side 11 and the lower side 12 that are in contact with the rail smoothly abut against the side surface of the rail, and the central part is not so close to the rail.

The rails for the seam plate 1 are formed by the core part bulky roving 1a ₁ and the line array-like thermosetting resin 1B that at roving 1A reinforced along the longitudinal direction including the roving 1a ₂ . It is preferable that a skin layer is appropriately formed on the surface. Content in the total roving 1A bulky roving 1a ₁ for reinforcing the core portion is 10 to 25 wt%.

The rail joint plate 1 is manufactured by a pultrusion molding method. That is, although not particularly shown, a roving containing a bulky roving in a core portion impregnated with a thermosetting resin liquid is passed through a pultrusion molding having a cross-sectional inner shape corresponding to a product cross-sectional shape so as to be pulled out. Manufactured.

At this time, the fibers oriented in the random direction of the bulky roving enter between the linearly oriented rovings, and the crossings of the rovings occur, and are fixed in the thermosetting resin in that state. Even if the wall thickness is large, a large crack due to curing shrinkage of the thermosetting resin does not occur in the core portion in the longitudinal direction. As shown in FIG. 1, the rail joint plate 1 is provided with a plurality of through holes 13 for bolt insertion so as to be arranged in series in the longitudinal direction.

Next, the manner of use of the rail joint plate 1 shown in FIG. 1 will be described with reference to FIGS. A rail 2 and an end 23 of the rail 2 connected with a gap 21 therebetween,
In a state of straddling the side portions of the rail 23, the positions of the bolt insertion holes 13 of the rails are overlapped, and the rails are applied to the rails from the left and right sides of the column portion 21 of the rail 2, and the bolt insertion holes 24 and the through holes The bolt 3 is inserted into the nut 13, and the nut 5 is screwed through the washers 4 and 4 to be fixed.

[0021]

The present invention will be described below with reference to examples. Example As a roving having a linear orientation, glass roving [“# 4450” manufactured by Asahi Fiberglass Co., Ltd. (weight: 4.45 g)
/ M, filament diameter 13 μm). As bulky roving, bulky glass roving ("Farmoroke yarn" manufactured by FRP Co.) was used. As the thermosetting resin liquid, a vinyl ester resin (8250H manufactured by Nippon Yupika Co., Ltd.) was used.

A glass roving containing a bulky glass roving in the core portion impregnated with a vinyl ester resin liquid (73% by weight of total glass roving, 20% by weight of bulky glass roving in all glass rovings) Was drawn through a draw-molding with a rectangular cross section corresponding to the product cross-sectional shape to produce a rail joint plate as shown in FIG.

As a result, the core portion in the longitudinal direction has a length of 5 m.
Thus, a rail joint plate having no cracks larger than m was obtained. When measuring the longitudinal compressive strength, shear strength, bending strength, compressive strength in the direction perpendicular to the longitudinal direction, and shear strength of this rail joint plate, the entire amount was linearly arrayed without using bulky glass roving. Except that the glass roving was used, it was improved by about 10% compared to the rail joint plate manufactured in the same manner as in the example.

[0024]

Since the rail joint plate of the present invention is as described above, no large cracks are generated in the longitudinal core portion at the time of drawing, and the strength in the longitudinal direction and the direction perpendicular to the longitudinal direction is eliminated. Is excellent.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an example of a rail joint plate of the present invention.

FIG. 2 is a cross-sectional view illustrating a use mode of the rail joint plate shown in FIG.

FIG. 3 is a front view of FIG. 2;

FIG. 4 is a front view showing a roving in a linear orientation.

FIG. 5 is a front view showing an example of bulky roving used in the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rail joint plate 2 Rail 1A Roving 1a ₁ Bulk roving 1a ₂ Linearly oriented roving

Claims (1)

[Claims] 1. A rail joint plate for connecting between ends of rails facing each other with a gap so as to straddle both side surfaces of the rails, the roving including bulky rovings extending along the longitudinal direction. A seam plate for rails, formed of a reinforced thermosetting resin, wherein the content of the bulky roving in all the rovings is 10 to 25% by weight.